JP5169660B2 - Control device and air conditioner - Google Patents

Description

  The present invention relates to a home air conditioner used in a general household, such as an air purifier, and a control device applied to the air conditioner.

  Conventionally, home air conditioners are equipped with a high-voltage power supply unit that boosts a voltage input from a commercial power supply (for example, commercial voltage AC100V) through a switch power supply circuit to a predetermined voltage (for example, 5 to 6 kV). There is a case. For example, in the case of an air purifier, the switch power supply circuit may operate and the high voltage power supply unit may be driven even after the operator opens the front panel and the electrical connection between the commercial power supply and the switch power supply circuit is released. is there. Such driving of the high-voltage power supply unit causes a dangerous state (electric shock or the like) in which the operator touches the high-voltage portion of the high-voltage power supply unit in maintenance management performed by opening the front panel. In order to avoid such a dangerous state, a zero cross circuit (for example, see Patent Document 1) that detects a zero cross point in which a voltage supplied from a commercial power supply crosses a predetermined voltage range is mounted, and detection of this zero cross point is performed. The connection state between the commercial power supply and the switch power supply circuit may be determined based on the result. When the disconnection between the commercial power supply and the switch power supply circuit is detected, the driving of the high-voltage power supply unit is stopped.

Japanese Patent Laid-Open No. 2005-117813

  By the way, in the air conditioner mentioned above, in order to operate a zero cross circuit, the consumption current of about 20 mA is required, for example. Therefore, if the zero cross circuit is always operated even after the commercial power supply and the switch power supply circuit are electrically connected and the high-voltage power supply unit is stopped, the power consumed by the air conditioner cannot be reduced. is there.

  An object of the present invention is to provide a control device and an air conditioner that can save power consumption while ensuring the safety of the user's work.

In the control device according to the first aspect of the present invention, voltage conversion means for converting the voltage supplied from the external power supply and then outputting to the electrical equipment, switching means for switching the connection state between the external power supply and the voltage conversion means, State detection means for detecting that the power supply and voltage conversion means are not connected, and power supply means for driving a relay circuit for switching between a state in which power is supplied to the state detection means and a state in which no power is supplied The circuit on the external power supply side and the circuit on the electrical equipment side are insulated, and the power supply means supplies power to the state detection means while the electrical equipment is being driven, A predetermined period included in a period corresponding to a state in which the electric device is not driven after the supply of power is started by changing from a state in which the power source and the voltage conversion unit are not connected to a state in which the power source is connected. During stops the power supply to the state detecting means.

  In this control device, it is included in the period corresponding to the state in which the electric device is not driven after the start of power supply to the state detecting unit by changing from the state in which the external power source and the voltage converting unit are not connected to the connected state. During the predetermined period, the power supply to the state detecting means is stopped. In other words, as in the prior art, it is possible to prevent the power supply to the state detection means from being constantly supplied after the external power supply and the voltage conversion means are electrically connected and while the driving of the electric device is stopped. Therefore, the power consumed by the air conditioner can be reduced compared to the conventional case.

  In the control device according to the second invention, in the control device according to the first invention, the state detection means includes zero-cross detection means for detecting a zero-cross point of the external power supply, and the external power supply based on the detection result of the zero-cross detection means And that the voltage conversion means is not connected.

  In this control device, the state detection unit is configured as a zero cross detection unit capable of detecting a zero cross point where the voltage supplied from the external power source crosses a predetermined voltage range, thereby connecting the external power source and the voltage conversion unit. It can be easily detected. According to this configuration, for example, even if a predetermined period has elapsed since the previous detection of the zero cross point, if the next zero cross point is not detected, the external power supply and the voltage conversion means are not connected. It can be detected.

  In the control device according to the third invention, in the control device according to the first or second invention, the electrical device is a high-voltage power supply unit.

  In this control apparatus, even when the electric device is configured as a high-voltage power supply unit that boosts the voltage input from the voltage conversion means via the switching means to a high voltage (for example, 5 to 6 kV), It is possible to prevent the power supply to the state detection means from being constantly supplied after the conversion means is electrically connected and while the driving of the high-voltage power supply unit is stopped. Therefore, the power consumed by the air conditioner can be reduced compared to the conventional case.

  In the air conditioner pertaining to the fourth invention, the control device pertaining to any one of the first to third inventions is controlled.

  In this air conditioner, it is possible to prevent the power supply to the state detection unit from being constantly supplied after the external power source and the voltage conversion unit are electrically connected and while the driving of the electric device is stopped. Therefore, the power consumed by the air conditioner can be reduced compared to the conventional case.

  As described above, according to the present invention, the following effects can be obtained.

  In the first aspect of the present invention, after the start of power supply to the state detecting means by changing from the state where the external power source and the voltage converting means are not connected to the connected state, the period corresponding to the state where the electric device is not driven. The power supply to the state detection unit is stopped during the included period. In other words, as in the prior art, it is possible to prevent the power supply to the state detection means from being constantly supplied after the external power supply and the voltage conversion means are electrically connected and while the driving of the electric device is stopped. Therefore, the power consumed by the air conditioner can be reduced compared to the conventional case.

  In the second invention, the state detection means is configured as a zero cross detection means capable of detecting a zero cross point where the voltage supplied from the external power supply crosses a predetermined voltage range, so that the external power supply and the voltage conversion means The connection state can be easily detected. According to this configuration, for example, even if a predetermined period has elapsed since the previous detection of the zero cross point, if the next zero cross point is not detected, the external power supply and the voltage conversion means are not connected. It can be detected.

  In the third aspect of the invention, even when the electric device is configured as a high-voltage power supply unit that boosts the voltage input from the voltage conversion unit through the switching unit to a high voltage (for example, 5 to 6 kV), It is possible to prevent the power supply to the state detecting means from being constantly supplied after the power supply and the voltage converting means are electrically connected and while the driving of the high-voltage power supply unit is stopped. Therefore, the power consumed by the air conditioner can be reduced compared to the conventional case.

  According to the fourth aspect of the present invention, it is possible to prevent power supply to the state detection means at all times after the external power supply and the voltage conversion means are electrically connected and while the driving of the electric device is stopped. Therefore, the power consumed by the air conditioner can be reduced compared to the conventional case.

  Hereinafter, the control apparatus of the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a block diagram illustrating a configuration of a control device according to an embodiment of the present invention.

  The control device 100a mounted on the air purifier 100 (air conditioner) includes a safety switch 2 (switching means), a switch power supply circuit 3 (voltage conversion means), a high-voltage power supply unit 4 (electric equipment), a relay circuit 5, and a relay. It has a drive circuit 6 (power supply means), a zero cross detection circuit 7 (state detection means), and a microcomputer 8. The safety switch 2 is formed as a two-terminal type changeover switch having terminals 2a and 2b. The terminals 2a and 2b are respectively connected to the power transmission side H and the ground side C of the commercial power source 1 (external power source) with a commercial voltage AC (for example, 100V).

The switch power supply circuit 3 includes a full-wave rectifier 9, a transformer 10, capacitors C ₁ and C ₂ , a diode D, and an inductance L. Each input of the full-wave rectifier 9 is connected to the terminal 2b of the safety switch 2 and the ground side C of the commercial power source 1, respectively. Each output of the full-wave rectifier 9 are connected to the connection node 11 and 12 the capacitor C ₁ is interposed.

Each input of the transformer 10 is connected to the connection nodes 11 and 12, respectively. The output of the transformer 10 is connected to the anode side of the diode D. The cathode side of the diode D is connected to the connection node 13. The transformer 10 converts the voltage input via the connection nodes 11 and 12 into a predetermined DC voltage Vout, and outputs the converted DC voltage Vout to the connection node 13. Capacitor _{C 2} includes a connection node 13 is connected between the ground line GND. The inductance L is connected between the connection node 13 and the input 4 a of the high voltage power supply unit 4.

The high voltage power supply unit 4 is driven according to the DC voltage Vout input from the switch power supply 3. The relay circuit 5 includes a switch unit 14 and a coil unit 15. The switch unit 14 is formed as a two-terminal changeover switch having terminals 14a and 14b. The terminals 14a and 14b are connected to the ground side C of the commercial power source 1 and one end of the resistor R, respectively. Terminal 15a of the coil section 15 which functions as an electromagnet is connected to the drain of the relay driving circuit 6 formed as a transistor Tr _1. On the other hand, the terminal 15b of the coil portion 15 is connected to the ground line GND.

The source of the relay drive circuit 6 is connected to a source voltage line V _SS (for example, 12 V). The gate of the relay drive circuit 6 is connected to the output port of the microcomputer 8. The relay drive circuit 6 receives from the output port of the microcomputer 8 a signal that permits detection of the zero-cross signal Sz (hereinafter, detection permission signal DE). The relay drive circuit 6 connects the source voltage line _VSS to the ground line GND via the coil unit 15 in response to, for example, a high level (“H”) of the detection permission signal DE. As a result of this connection, a current flows through the coil portion 15, the contact of the switch portion 14 is closed, and detection of the zero cross signal Sz by the zero cross detection circuit 7 is started.

The zero cross detection circuit 7 includes photodiodes PD ₁ and PD ₂ and a phototransistor PTr connected in parallel. The input terminal 7a of the zero cross circuit 7 is connected to the terminal 2b of the safety switch 2, and the input terminal 7b is connected to the other end of the resistor R. The output terminal 7c of the zero-cross circuit 7 is connected to the input port 8a of the microcomputer 8, and the output terminal 7d is connected to the ground line GND.

The photodiodes PD ₁ and PD ₂ photoelectrically convert electric signals input via the input terminals 7a and 7b into optical signals, and output the photoelectrically converted optical signals to the phototransistor PTr. The phototransistor PTr photoelectrically converts the received optical signal into an electrical signal, and outputs the photoelectrically converted electrical signal to the microcomputer 8 as a zero cross signal Sz.

Output port 8b of microcomputer 8 is connected to the gate of the transistor Tr _2. The drain of the transistor Tr ₂ is connected to the ground line GND. The source of the transistor Tr ₂ is connected to the input of the high voltage power supply unit 4. The transistor Tr ₂ receives from the output port 8 b of the microcomputer 8 a signal for permitting connection between the input 4 b of the high-voltage power supply unit 4 and the ground line GND (hereinafter referred to as connection permission signal CE). Transistor Tr _2, for example in response to the high level of the connection enable signal CE ( "H"), for connecting the input 4b of the high-voltage supply unit 4 and the ground line GND. By this connection, the high-voltage power supply unit 4 starts driving, and boosts the voltage Vout input from the switch power supply 3 to a predetermined voltage.

  FIG. 2 is an explanatory diagram illustrating a detection operation of the zero cross signal Sz. 2A shows the waveform of the commercial voltage AC whose amplitude repeats at a constant period (for example, if the frequency is 50 Hz, one period is 20 ms), and FIG. 2B shows the output of the zero-cross detection circuit 7 (zero-cross signal Sz). FIG. 2C shows the output (DC voltage Vout) of the switch power supply circuit 3. FIG. 2D shows ON / OFF of the relay circuit 5, and FIG. 2E shows the connection permission signal CE.

In this example, in the initial state (time t ₀ ), the power plug of the air cleaner 100 is inserted into an outlet, and the commercial power supply 1 and the switch power supply circuit 3 are electrically connected via the safety switch 2. In this initial state, the connection permission signal CE is set to a high level (“H”), the high voltage power supply unit 4 is being driven, the relay circuit 5 is turned on, and the microcomputer 8 outputs the zero cross detection circuit 7. Detection of a zero cross point based on (zero cross signal Sz) is performed.

  The zero cross point indicates a point where the commercial voltage AC crosses a predetermined voltage range including a reference voltage value (for example, 0 V). Then, the microcomputer 8 determines whether the commercial power source 1 and the switch power source circuit 3 are electrically connected based on the detection result. Specifically, the microcomputer 8 electrically connects the commercial power supply 1 and the switch power supply circuit 3 when the next zero cross point is not detected even after a half cycle (for example, 10 ms) has elapsed since the previous detection of the zero cross point. Judge that it is not connected.

At time t _1, the front panel of the air cleaner 100 is opened by the user, the microcomputer 8 determines that the electrical connection between the commercial power supply 1 and the switching power supply circuit 3 is released based on the zero-cross signal Sz.

At time t ₂ , the microcomputer 8 sets the connection permission signal CE to a low level (“L”) in response to the disconnection of the electrical connection between the commercial power supply 1 and the switch power supply circuit 3. The connection between the input of the high-voltage power supply unit 4 and the ground line GND is released, and the high-voltage power supply unit 4 stops driving by this connection release.

Then, at time t ₃ when the delay time ta has elapsed from the time t _2, the response to the driving of the high-voltage supply unit 4 is stopped, the relay circuit 5 is turned off, the detection of the zero cross signal Sz by the zero-cross detection circuit 7 finish. This delay time ta is set in order to stop the driving of the high-voltage power supply unit 4 more reliably.

At time t ₄ when from time t ₁ has elapsed time tb, the discharge of charge stored in the capacitor C _1, C _2, which is built into the switch power supply circuit 3 is completed. Then, at time t ₅ after a predetermined time from the time t _4, the user by closing the front panel of the air purifier 100, the commercial power supply 1 and the switching power supply circuit 3 is electrically connected, at time t _6, Output of the DC voltage Vout by the switch power supply circuit 3 is started.

At time t _7, in response to the output start of the DC voltage Vout by the switch power supply circuit 3, a relay circuit 5 is turned on, the zero-crossing detection circuit 7 starts detection of the zero-cross signal Sz.

Then, at time t _8, the operation mode of the air cleaner 100 enters the standby mode. The microcomputer 8 sets the detection permission signal DE to a low level (“L”) in synchronization with the entry into the standby mode, and disconnects the relay circuit 5 by disconnecting the source voltage line _VSS and the ground line GND. It is turned off and the detection of the zero cross signal Sz by the zero cross detection circuit 7 is ended.

At time t ₉ , the microcomputer 8 sets the detection permission signal DE to a high level (“H”) in response to the operation start request of the air purifier 100, and the source voltage line _VSS and the ground line GND. And the relay circuit 5 is turned on, and detection of the zero-cross signal Sz by the zero-cross detection circuit 7 is started. In a subsequent time t _10, the microcomputer 8, the connection permission signal CE is set to a high level ( "H"), as well as connecting the input of the high-voltage supply unit 4 and the ground line GND, high-voltage supply unit 4 by the connection Start driving.

Above, in this embodiment, from the time t ₈ the air cleaner 100 enters the standby mode, the period until time t ₉ for receiving the operation start request of the air cleaner 100 (predetermined period), and turns off the relay circuit 5 By ending the detection of the zero cross signal Sz by the zero cross detection circuit 7, the power consumption of the relay circuit 5, the relay drive circuit 6 and the zero cross detection circuit 7 in the standby mode can be reduced. Therefore, the power consumption of the air cleaner 100 can be reduced as compared with the conventional air cleaner that always operates the zero cross detection circuit 7 even after the high-voltage power supply unit 4 is stopped.

  When the front panel of the air purifier 100 is opened by the user, the microcomputer 8 determines that the electrical connection between the commercial power supply 1 and the switch power supply circuit 3 is released based on the zero cross signal Sz, and the high voltage By stopping the drive of the power supply unit 4, that is, by preventing the high-voltage power supply unit 4 from being driven even after the electrical connection between the commercial power supply 1 and the switch power supply circuit 3 is released, the user can When the front panel of the cleaner 100 is opened and maintenance work or the like of the air cleaner 100 is performed, it is possible to avoid a danger such as an electric shock caused by a user touching the high voltage portion of the high voltage power supply unit 4.

  In general, an air cleaner is a typical example of a structure in which a high-voltage power supply unit is mounted and the power supply is shut off by detection of a front panel. In addition, there are many destinations for air cleaners, and there are regulations on standby power. Moreover, if it is a floor-standing type air cleaner, it is easy for a user to touch, and the situation which opens a front panel during driving | operation tends to generate | occur | produce. Therefore, when the control device 100a of the present invention is applied to the air cleaner 100, it is particularly effective.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is indicated not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the above-described embodiment, the example in which the driving of the high-voltage power supply unit 4 is stopped when the front panel of the air purifier 100 is opened by the user has been described. The present invention is not limited to such an embodiment. For example, when the power plug of the air cleaner 100 is removed from the outlet by the user, the driving of the high-voltage power supply unit 4 may be stopped.

In the embodiment described above, (at time t ₃₎ time t ₂ at the timing the delay time ta has elapsed since the driving of the high-voltage supply unit 4 is stopped, we have dealt with the cases of turning off the relay circuit 5. The present invention is not limited to such an embodiment. For example, in order to more reliably reduce the power consumed by the relay circuit 5, the relay drive circuit 6, and the zero-cross detection circuit 7 after the drive of the high-voltage power supply unit 4 is stopped, at a timing synchronized with the drive stop of the high-voltage power supply unit 4 ( at time t _2), it may be turned off relay circuit 5.

  In the above-described embodiment, the example in which the control device 100a is mounted on the air cleaner 100 has been described. The present invention is not limited to such an embodiment. The control device 100a may be used for other air conditioners. For example, the present invention is particularly effective when the control device of the present invention is applied to a fan and applied to a fan drive device of a mechanically dangerous fan.

  By using the present invention, it is possible to obtain a control device and an air conditioner that can save power consumption while ensuring the safety of the user's work.

It is a block diagram which shows the structure of the air cleaner to which the control apparatus which concerns on one Embodiment of this invention is applied. It is explanatory drawing which shows the detection operation | movement of a zero cross signal.

1 Commercial power supply (external power supply)
2 Safety switch (switching means)
3 Switch power supply circuit (voltage conversion means)
4 High voltage power supply unit (electric equipment)
6 Relay drive circuit (power supply means)
7 Zero cross detection circuit (state detection means)
8 microcomputer 100 air purifier 100a control device

Claims (4)

Voltage conversion means for outputting to an electrical device after converting the voltage supplied from an external power source;
Switching means for switching a connection state between the external power source and the voltage conversion means;
State detection means for detecting that the external power supply and the voltage conversion means are not connected;
Power supply means for driving a relay circuit for switching between a state of supplying power to the state detection means and a state of not supplying power;
The circuit on the external power supply side and the circuit on the electrical equipment side are insulated,
The power supply means supplies power to the state detection means while the electric device is being driven, and changes from a state in which the external power supply and the voltage conversion means are not connected to a connected state. A control device characterized in that power supply to the state detection means is stopped for a predetermined period included in a period corresponding to a state in which the electric device is not driven after the start of power supply.   The state detection means includes a zero cross detection means for detecting a zero cross point of the external power supply, and the external power supply and the voltage conversion means are not connected based on a detection result of the zero cross detection means. The control device according to claim 1, wherein the control device is detected.   The control device according to claim 1, wherein the electrical device is a high-voltage power supply unit. The air conditioner characterized by controlling the control apparatus of any one of Claims 1-3.

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